react-laze/dist/esm/development/index.mjs

Lazily render components in React

// src/useLaze.ts
import { useDebugValue as useDebugValue4, useEffect, useState as useState2 } from "react";

// src/useReactiveRef.ts
import { useDebugValue as useDebugValue3, useState } from "react";

// src/useConstant.ts
import { useDebugValue as useDebugValue2 } from "react";

// src/useLazyRef.ts
import { useDebugValue, useRef } from "react";
function useLazyRef(supplier) {
  const ref = useRef();
  if (!ref.current) {
    ref.current = {
      current: supplier()
    };
  }
  useDebugValue(ref.current);
  return ref.current;
}

// src/useConstant.ts
function useConstant(supplier) {
  const { current } = useLazyRef(supplier);
  useDebugValue2(current);
  return current;
}

// src/useReactiveRef.ts
function useReactiveRef(supplier) {
  const [state, setState] = useState(supplier);
  const ref = useLazyRef(supplier);
  if (ref.current !== state) {
    ref.current = state;
  }
  const proxyObject = useConstant(() => ({
    get current() {
      return ref.current;
    },
    set current(value) {
      setState(() => value);
    }
  }));
  useDebugValue3(proxyObject);
  return proxyObject;
}

// src/useLaze.ts
function useLaze(options) {
  const [visible, setVisible] = useState2(false);
  const ref = useReactiveRef(() => null);
  const { current } = ref;
  const shouldRefresh = options == null ? void 0 : options.refresh;
  useEffect(() => {
    setVisible(false);
    if (current) {
      const observer = new IntersectionObserver((entries) => {
        for (const entry of entries) {
          if (shouldRefresh) {
            setVisible(entry.isIntersecting);
          } else if (entry.isIntersecting) {
            setVisible(true);
            observer.disconnect();
          }
        }
      });
      observer.observe(current);
      return () => {
        observer.unobserve(current);
        observer.disconnect();
      };
    }
    return void 0;
  }, [current, shouldRefresh]);
  const value = {
    ref,
    visible
  };
  useDebugValue4(value);
  return value;
}
export {
  useLaze as default
};
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